Multiple choice What is the young one of a whale is called? Whalet Calf Filly Cub Reveal answer Fill a bubble to check yourself B Correct answer Explanation A young whale is called a calf. Whalet is not a valid term, filly is a young female horse, and cub is the young of bears, lions, and other land mammals. Marine mammals like whales, dolphins, and manatees all have their young called calves.